Purchased intangible assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Purchased intangible assets

Purchased intangible assets 

Purchased intangible assets consist of the following (in thousands): 

	December 31, 2019							December 31, 2018
	Gross Assets		Accumulated Amortization			Net Assets		Gross Assets		Accumulated Amortization			Net Assets
Technology and patents	$	36,880	$	(35,555	)	$	1,325	$	37,029	$	(34,995	)	$	2,034
Customer relationships	15,089		(15,089		)	—		15,146		(15,026		)	120
Leasehold interest	1,222		(396		)	826		1,238		(374		)	864
	$	53,191	$	(51,040	)	$	2,151	$	53,413	$	(50,395	)	$	3,018

 

Amortization expense relating to technology and patents and the leasehold interest intangible assets is included within cost of goods sold, and customer relationships and the non-compete agreements within operating expenses.

The following table presents details of the amortization expense of the Company’s purchased intangible assets as reported in the consolidated statements of operations (in thousands): 

	Years ended December 31,
	2019		2018		2017
Cost of goods sold	$	737	$	756	$	869
Operating expenses	119		475		472
Total	$	856	$	1,231	$	1,341

 

The estimated future amortization expense of purchased intangible assets as of December 31, 2019, is as follows (in thousands): 

2020	$	736
2021	644
2022	27
2023	27
2024	27
Thereafter	690
	$	2,151